Is it possible to see an object's positions at different frames all at once?
The technique you're referring to is usually called &quot;onion skinning&quot; or &quot;ghosting&quot;. An implementation that fits your needs exists for Armatures and Grease Pencil.
Other kinds of animations don't have an equally good implementation of this: objects' midpoints can be &quot;ghosted&quot; for rigid motion (but this ignores rotation/scale and requires constant updates of your cache), while very little is present (as far as I know) for &quot;soft&quot;, shape-deforming, motion.
Here you go:
Armature
If your object is driven by an armature, then it's possible to enable ghosting from the Object Data properties panel of the armature:

Just increase the &quot;range&quot; option under Ghost.
Grease Pencil
Onion skinning is also available for the Grease Pencil as a &quot;Layers&quot; setting. The options are in the &quot;N menu&quot; in the 3D viewport:

Rigid motion
For keyframed objects or rigid bodies, you can display the trajectory of their origin points using &quot;Motion Paths&quot;. These paths must however be updated every time you change something (it's fast, but requires a click and can be distracting). I couldn't find a way to also &quot;ghost&quot; the orientation/shape.

[ Just a word on dupliframes: alternatively, it's possible to switch the object's duplication object, from the same property panel, from &quot;none&quot; to &quot;frame&quot;: this will display all the frames in the same way as the current one (no transparency, no customisation), and must be switched back to &quot;none&quot; as soon as you're done animating. Please note that this is not a visualisation tool made for the purpose of ghosting, but a technique for instancing, that is supposed to be used at render time as well! ]
Particles and Point cache simulations (soft body + cloth)
(Just to make a complete review I'll add this, even if it's not related to your question)
For particle and &quot;soft&quot; simulations, after baking, the trajectories of the particles or of the vertices can be shown in Particle Edit mode and tweaked with the &quot;Draw: Path Steps&quot; and &quot;Fade Time&quot;, &quot;Fade Time: Frames&quot; options.